Draw a line from the center of the circle to the point on the circumference where the chord intersects. What do you call that line? Any line that runs from the center of a circle to the circumference is called a RADIUS! The radius is 13 cm. Now draw a line from the center of the circle to the center of the chord. That line is 5 cm and it forms a 90 degree angle to the chord. Now you have a scalene or right triangle. Using a^2 + b^2 = c^2 Then radius (c) ^2 - a^2 = b (1/2 chord) ^2

Do the math and double the answer to find total length of chord.

Do the math and double the answer to find total length of chord.